diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index 51961d2060..17f1927465 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -395,7 +395,7 @@ efi_status_t efi_install_configuration_table(const efi_guid_t *guid, void *table
 	/* Add a new entry */
 	memcpy(&efi_conf_table[i].guid, guid, sizeof(*guid));
 	efi_conf_table[i].table = table;
-	systab.nr_tables = i;
+	systab.nr_tables = i + 1;
 
 	return EFI_SUCCESS;
 }